M40 concrete is preferred to m20 concrete for prestressed concrete to
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Case 1) Take 20 bars, give a strain of 0.1 ...
Force = Stress * Area
= E * Strain * Area
= 100 kN/mm2 * 0.1 * 1 mm2
= 10 kN
Total force = 200 kN (for 20 bars)
Case 2) Take 1 prestressing cable, give a strain of 2 ...
Force = E * Strain * Area
= 100 kN/mm2 * 2 * 1 mm2
= 200 kN
Force = Stress * Area
= E * Strain * Area
= 100 kN/mm2 * 0.1 * 1 mm2
= 10 kN
Total force = 200 kN (for 20 bars)
Case 2) Take 1 prestressing cable, give a strain of 2 ...
Force = E * Strain * Area
= 100 kN/mm2 * 2 * 1 mm2
= 200 kN
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